Printing telegraph apparatus



R. D. SALMON PRINTING TELEGRAPH APPARATUS Jan, 18, 1944.

File d March 4, 1945 Patented Jan. 18, 1944 UNITED STATES PRINTING TELEGRAPH APPARATUS Reginald Dennis Salmon, Croydon, England, assignor to Creed and Company Limited, Croydon, England, a British company Application March 4, 1943, Serial No. 477,926 In Great Britain April 3, 1942 5 Claims.

This invention relates to means for closing electric circuits under control of permutation code signals such as start stop five unit teleprinter code signals.

According to the present invention we provide a telegraph receiver of the kind in which a shaft is selectively rotated in accordance with a received code combination comprising a plurality of sets of contacts arranged concentrically of said shaft, a plunger for each set of contacts adapted to be moved radially of said shaft, a push rod mounted radially of said shaft in the plane of the plungers, means operative after the selective positioning of said shaft for moving said push rod radially to operate one of said plungers and means for holding said plunger in operated position.

The invention will be better understood from the following description taken in conjunction with the accompanying drawing which shows one embodiment of the invention.

The shaft 2 is the shaft upon which the typewheel of a printing telegraph receiver may be mounted. This shaft is selectively brought into position in which a desired character is to be printed by a selecting mechanism responsive to received code combinations, such for example as that described in British application No.

8,566/41. In carrying out the present invention the typewheel is replaced by a sleeve 23?, a bell crank 231 carrying a push rod 238, a plunger 233 and a collar 236 slidably mounted on the shaft. The plunger 233 is slidable in sleeve 231 and is spring loaded so that one end engages the collar 236 and the other rests against the bell crank 231. Arranged radially around the shaft 2 and in the plane of push rod 238 are spring loaded plungers 215, one only of which is shown, whilst opposite each plunger is a set of contacts 216, 211. Each plunger 215 is mounted to move radially in fixed members 213 and 235. A collar 214 fixed to each plunger normally rests on member 235 and a spring 201 surrounding the plunger is between collar 215 and member 2E3. A spindle 220 is mounted in line with shaft 2 to slide in a bearing bush (not shown). The bearing bush carries a 3-armed spider 218 supporting a ring 211 having an inner flange 221. A second S-armed spider 216 is fixed on spindle 226 and rests against flange 221. A collar 216 on each plunger 215 normally rests just below the ring 211.

Cams 225 and 226 are fixed on a cam sleeve 1 on which are also fixed the cams (not shown) for effecting the selective positioning of shaft 2 under control of the received code combination. Cam 225 acts on a bell crank 224 upon the horizontal arm of which rests one arm of a bell crank 222, pivoted at 223, the other arm of which engages in a slot in spindle 2211. Cam 226 acts on one arm of a lever 228, pivoted at 229, the other arm of which engages under a stud on a bell crank 234 engaging collar 236.

The sequence of operation is as follows: Shaft 2 is selectively positioned under the control of a received code combination, thereby bringing push rod 238 opposite one of the plungers 215. Cam 225 thereupon rotates bell brank 22d clockwise, raising the horizontal arm thereof and rotating bell crank 221 anti-clockwise against spring 222. Spindle 2211 is drawn to the left in the drawing, and spider 219 causes ring 211 to be drawn slightly to the left by straining spider 218. This releases any previously operated plunger and leaves all plungers free to be moved.

Cam 226 thereupon operates lever 228 against spring 232 causing it to rock bell crank 234 anticlockwise and so slide sleeve 236 to the left in the drawing and with it plunger 233. This latter in turn actuates bell crank 231 and moves push rod 238 against the selected plunger 215. The plunger 2i5 closes its corresponding contacts 216, 211. Immediately the plunger 215 is moved, cam 225 allows bell crank 221 to restore to normal under the action of its spring 222, permitting ring 211 to engage the inner side of the collar 215 on the selected plunger 215. The latter is thus held in selected position with the desired contacts closed.

What is claimed is:

1. Telegraph receiver of the kind in which a shaft is selectively rotated in accordance with a received code combination comprising a plurality of sets of contacts arranged concentrically of said shaft, a plunger for each set of contacts adapted to be moved radially of said shaft, a push rod mounted radially of said shaft in the plane of the plungers, means operative after the selective positioning of said shaft for moving said push rod radially to operate one of said plungers and holding means for holding said operated position, said common latch comprising a ring engaging a collar on each of said plungers.

4. Telegraph receiver as claimed in claim 1 in which said holding means comprises a common latch for holding any of said plungers in operated position, said common latch comprising a ring engaging a collar on each of said plungers, engaging on the side of said collar towards said shaft on each operated plunger and 10 on the opposite side of said collar on each nonoperated plunger. 

